package com.heima.kafka;

import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.common.TopicPartition;

import java.time.Duration;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;

/**
 * @author 晓风残月Lx
 * @date 2023/8/10 10:14
 * 消费者
 */
public class ConsumerQuickStart {

    public static void main(String[] args) {

        //1.kafka的配置信息
        Properties properties = new Properties();
        //连接地址
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.200.130:9092");
        //设置消费者组 同组下的消费者订阅的共同主题只有一个消费者才能接收到 一对一  多组才能实现一对多
        properties.put(ConsumerConfig.GROUP_ID_CONFIG, "group1");
        //反序列化器
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        //手动提交偏移量
        properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);

        //2.创建消费者对象
        KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(properties);

        //3.订阅对象
        consumer.subscribe(Collections.singletonList("itcast-topic-input"));

        //4.拉取消息
//        while (true) {
//            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
//            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
//                System.out.println(consumerRecord.key());
//                System.out.println(consumerRecord.value());
//                System.out.println(consumerRecord.partition());
//                System.out.println(consumerRecord.offset());
//
////                try {
////                    //同步提交偏移量
////                    consumer.commitSync();;
////                } catch (CommitFailedException e) {
////                    System.out.println("记录提交失败的异常" + e);
////                }
//
//                //异步的方式提交偏移量
////                consumer.commitAsync(new OffsetCommitCallback() {
////                    @Override
////                    public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
////                        if (e != null) {
////                            System.out.println("记录错误的提交偏移量：" + map + ",异常信息为：" + e);
////                        }
////                    }
////                });
//            }
//        }

        //4.拉取消息
        //同步和异步提交偏移量
        try {
            while (true) {
                ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
                for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                    System.out.println(consumerRecord.key());
                    System.out.println(consumerRecord.value());
                    System.out.println(consumerRecord.partition());
                    System.out.println(consumerRecord.offset());
                }
                //异步提交偏移量
                consumer.commitAsync();
            }
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("记录错误的信息：" + e);
        } finally {
            //异步出现错误使用同步方式
            consumer.commitSync();
        }

    }

}
